When my daughter had just turned 7, she asked for us to build a puzzle box that only she could open. She drew up her projections here:
That was almost 4 years ago. We brainstormed, tweaked designed (and re-designed) a puzzle box together and finally produced this:
Here’s the youtube walkthrough on how to open it
We learned so many new techniques. Almost exclusively built with our glowforge and 3d printer (Zortrax m200).
Lots of fun!
This is just beyond fantastic!! I had a game a couple of years back that was similar. This is just great - I’m totally impressed it would never be able to do anything like this myself. A super Duper project to do with your kid!
Holy heckin’ framenschnaps, Batman. That’s flibbertygibbiting fantastic!!! Sorry…my brain is failing me at expletives at the moment, but…WOW!
VERY clever.
Wonderful! Parent of the decade nomination coming your way.
That is crazy coooooool!
Or a large hammer… 
j/k Seriously that is really amazing work. A lot of thought and detail went into that!! Nice
Hah! Yes, the large hammer works too
Totally speechless, but thinking I should just pack up my tools and go home.
That is so very cool! I was riveted watching your video - so many intricate steps. So glad you and your daughter figured all this out. Almost sad it is no longer a box only she can open… 
but what an excellent accomplishment.
Holy smokes that is incredible!
Great project for you to work on together! I believe it took a year. 
This is flippin’ genius! The video explaining it was great! You should sell it, or the plans on Etsy. It would be HUGE! How you came up with all the ideas used is mind boggling!
I feel so inadequate…
This is ingenious!
Unbelievable! That is a fantastic project. An engineer in the making! I will now scoot off and continue making my tea lights and coasters!
That is the most amazing thing I’ve seen in a long time! You should design those escape room apps like “the Room.”
And your blueprint is adorable.
That is fantastic!
Funny you mention “The Room”, that was a major inspiration for the project!
So incredible! Thanks for sharing! Any chance you’d make other puzzle box designs and sell them? that way your daughters box stays special and unique but that we might be able to buy and make one of your incredible designs.
Holy Awesomeness! It’s “The DaVinci Code”!
(I had a locking diary, and thought I was doing pretty well.) 
That’s incredible…great job on it!
